tree onion

noun

Definition of tree onion

  1. :  any of several perennial garden onions that constitute a variety (Allium cepa variety viviparum) of the common onion, are grown chiefly as a curiosity or for early salad onions, and are propagated by bulbils that replace the flowers in the inflorescence —called also Egyptian onion, top onion — compare multiplier onion

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